Mixing of homogeneous solids in bubbling fluidized beds: Theoretical modelling and experimental investigation using digital image analysis

CFD and experimental studies of solids hold-up distribution and circulation patterns in gas–solid fluidized beds

“…Comparison of simulation results using KTGF and CPV have been carried out. Comparison of bubble size distribution, bubble rise velocity and visible bubble flow rate with generally accepted correlations of Darton et al [31], Lim et al [32] and Hilligardt and Werther [33] and experimental data taken from the literature have been presented. It was observed that KGTF was able to predict the experimental data slightly better than CPV.…”

“…(32), some researchers [25,38,50,51] assume the granular energy is in a steady state and dissipated locally, and neglect convection and diffusion. Boemer et al [52] have carried out simulations using three granular temperature models (i.e., constant, algebraic expression and partial differential equation), and compared the simulated results with the experiments of Kuipers [53].…”

Practical validation of the two-fluid model applied to dense gas–solid flows in fluidized beds

“…In order to evaluate model predictions, simulation results are compared with literature correlations valid for 2D beds. Concerning the bubble size, Lim et al (1993) proposed…”

Narrow fluidised beds arranged to exchange heat between a combustion chamber and a CO2 sorbent regenerator

“…(2) we use the solid dispersion model (May, 1959) to fit the mixing data obtained in this work. This model is known to be not correct for many fluidised bed systems, specially when describing mixing in the axial directions, where it has been shown that the countercurrent back mixing model (Van Deemter, 1967) is more adequate representation of the transport mechanism of solids in the bed (Lim et al, 1993;Hoffman et al, 1993;Abanades and Grasa, 2001;Grasa and Abanades, 2002). However, for the purpose of heat transfer calculations in the fins in the lateral direction, the dispersion model is particularly convenient due to the link between thermal conductivity and dispersion coefficients established in Eq.…”